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Malicious files are often directly attached to emails. These files can be the malware itself or a malware downloader, but these executable files are often blocked by spam filters. Office documents and spreadsheets are often used that contain macros. If they are allowed to run, they will download the malicious payload. More companies are now providing security awareness training to their workforces and are warning about the risks of macros, and Microsoft is now disabling macros by default in Office files that are downloaded from untrusted sources via the Internet, so this method of malware delivery is becoming less effective.
Spear phishing emails can be very convincing. They can be personalized, highly targeted, include the correct branding and logos, have spoofed sender names, and make perfectly plausible requests. Social engineering techniques are used to get the recipient to take the requested action and to do so without thinking, such as enabling content when opening an email attachment. Untrained employees cannot be expected to know about these cyberattacks and scams, and that enabling content in a document or spreadsheet will allow macros to run, which will silently download malware.
The initial droppers use a variety of names linked to pirated software, including mirc-7-64-keygen-plus-crack-fully-version-free-download, officefix-professional6-122-crack-full-version-latest-2021, and setup-starter_v2.3.1. One of the droppers mimics a legitimate NVIDIA process, although the digital signature is unrelated to NVIDIA. Once users start processes with names in the word cloud of installers, the infection chain commences and will run in the background without alerting the user, with no visible windows displayed.
The initial phishing emails contain a legacy Word attachment (.doc) with a malicious macro that downloads a PowerShell script from GitHub if allowed to run. That script in turn downloads a PNG image file from the legitimate image sharing service Imgur. The image contains hidden code within its pixels which can be executed with a single command to execute the payload. In this case, a Cobalt Strike script.